335/45R17 vs 325/45R17
Going from one to the other changes the overall height by -1.2 %. That is inside the 3% band, so it fits and the speedometer stays close.
Side by side
| Measure | 335/45R17 | 325/45R17 | Change |
|---|---|---|---|
| Overall height | 28.9" | 28.5" | -1.2 % |
| Sidewall | 5.94" | 5.76" | -3.0 % |
| Section width | 335 mm | 325 mm | -3.0 % |
| Circumference | 90.7" | 89.6" | -1.2 % |
| Revs per mile | 699 | 707 | +1.2 % |
| Axle height | 14.44" | 14.26" | -4.5 mm |
| Approved rim width | 9.5–12.5" | 9–12" | overlap 9.5–12" |
Both are approved on a rim 9.5" to 12" wide. If yours is in that band, this is a tire change and nothing else.
What the speedometer will say
Calibrated for 335/45R17. Fit 325/45R17 and the needle stops telling the truth.
| Needle says | You are doing | Out by |
|---|---|---|
| 30 mph | 29.6 mph | -0.4 |
| 50 mph | 49.4 mph | -0.6 |
| 70 mph | 69.1 mph | -0.9 |
| 90 mph | 88.9 mph | -1.1 |
The odometer drifts with it. Ten thousand miles on the dial are really 9,877 on the road, so it over-counts by 123. At a true 70 mph the first turns 815 times a minute, the second 825.